Dang, I had the same error three hours ago. Might not be related but...
I did a fresh manual install of wordpress three hours ago at http://shop.rodneystevens.com
All good, all working.
I have Cloudflare SSL running on the main domain.
So I went into WP settings and changed the site url http to https
Logged out and tried to log back in via the https login...
Bam, 100% same message you get.
So into myPHPadmin to manually change https back to http
Login started to work again.

currently in the database, what's the url of your site, http or https?

Dang, I had the same error three hours ago. Might not be related but...
I did a fresh manual install of wordpress three hours ago at http://shop.rodneystevens.com
All good, all working.
I have Cloudflare SSL running on the main domain.
So I went into WP settings and changed the site url http to https
Logged out and tried to log back in via the https login...
Bam, 100% same message you get.
So into myPHPadmin to manually change https back to http
Login started to work again.

currently in the database, what's the url of your site, http or https?

Click to expand...

Hi. Thanks for the reply! I installed wordpress fresh using the https option, then set up cloudflare flex ssl. I assume the database must be ssl then. Maybe I'll try to install again...

Funny. I was able to "login" after re-install...however...I didn't actually login...I was logged in automatically or something. I'm not able to get into the admin area though. ERR_TOO_MANY_REDIRECTS. I'm wondering now if maybe I can ftp that flexable ssl plugin into wp and maybe that will fix it.